Transmission-gearing.



J. H. NAUMANN.

TRANSMISSION GEARING.

APPLICATION FILED MAY?. 1912.

Patented May 13, 1913.

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- of the parts of a transmission gearing to the UNITED STATES PATENTOFFICE.

JUSTUS H. NA'UMANN, 0F WOODLAKE, MINNESOTA, ASSIGNOE 0F ONE-FOURTH TOJ'. PAUL SCHERF, OF BALATON, MINNESOTA.

TRANSMISSION-GEARING.

Specification of Letters Patent.

Patented May 13,1913.

Application led May 7, 1912. Serial No. 695,791.

To all whom it may concernA Be it known that I, J Us'rUs Il. NAUAIANN,citizen of the United States. residing atv VVoodlake, in the county ofYellow Medicine and State of Minnesota, have invented certain new anduseful Improvements in Trans mission-Gearings, of which the following isa specification. I

This invention relates to transmission gearing, and one object of theinvention is to provide a gearing especially adapted for automobileswhere an easy, slow start of the vehicle is desired, capable of finallyproviding a direct drive between the motor and the traction wheels.

Another object ot' the invention is to provide a gearing which may hemanipulated by means Iof 4a single-lever, so as to produce the severaldifferent speeds desired, as well as to reverse the movement.

T he invention also seeks, generally, to simplify the ',onstruction andarrangement end that the cost of production and inaintenance may bei'educed and the liability of the gearing to get out of order minimized.

All these stated objects. and such other objects as will incidentallyappear as the description of the invention proceeds, are attained in agearing of the type illustrated in the accompanying drawings, and theinvention consists iu certain novel features which will be hereinafterfirst fully described and then more particularly pointed out in theappended claims.

In the drawings z-Figure 1 is a sectional elevation of my improvedgearing, showing, by full lines, the position of the parts immediatelyprior tothe coupling of the driving shaft directly to the driven shaft,and, by dotted lines, showing the position of the parts to accomplish areverse movement. Fig. 2 is a detail end elevation showing, more indetail, the reverse elements of the gearing.

The main frame, 1 may he of any usual or preferred construction, and atany convenient parts of the same, I provide bearings 2 in which thedriving shaft 3 and the driven shaft 4 are journaled. the driving shaft3 being connected directly with the mo-tor, not shown, and the drivenshaft 4 being connected with the axle carrying the traction wheels ofthe vehicle. as will be un dex-stood. The inner end of the driving shaft3 is equipped with a clutch member 5 adapted to be engaged by a sleeve 6on the driven shaft, constituting a co-acting clutch member, whereby thetwo shafts may be directly coupled, when so desired. The clutch membersare provided with intermeshing teeth or notches, indicated at 7, so thatwhen the sleeve (i is projected to the clutch member 5, the two memberswill be directly engaged, so to rotate together. The sleeve or clutchmember 6 is normally held away from the clutch member 5 by a spring 8housed within the sleeve and bearing against an internalflangc or rim ofthe same and against an angular head 9 on the end of the driven shaft,as shown. The sleeve (i of course, has an angular bore engaging theangulai' head 9, whereby the sleeve may slide axially of the'shaft,while, at the saine time, it will be compelled to rotate therewith.lonsequently, when the sleeve engages the clutch member 5, the rotationof said clutch member will be imparted directly to the sleeve, and by itto the angular head 9, so that the shaft 4f will be caused to rotatewith the driving shaft, and at the same speed.

To move the sleeve 6 into engagement with the clutch member 5, againstthe tension of the spring S, a trip lever 10 is fulerumed upon theframe, as indicated at 11, and has its free end arranged in the path ofmovement of an annular flange or shoulder l2 on the transmission roller13, the intermediate portion of this trip lever bear ing against thesleeve, as clearly shown in the drawing.

Fixed upon the driving shaft 3 is a tapered or conical roller 14 havingits smaller end disposed adjacent the clutch member and provided with anannular groove 15 immediately adjacent the said smaller end. A largerconical or tapered roller L6 is fixed upon the driven shaft 4, so as torotate therewith, and the smaller end of this roller 1G faces thesmaller end of the roller 1-'l. au annular groove 17 being formed in thesurface of the said roller 1G at. the larger end thereof. Thetransmission roller 13 is of such. form and dimensions that it willbridge the rollers 14 and 1G, and its ends are normally in contact withthe said rollers, whereby the rotation of the roller 14 will betransmitted through the roller 13 to the larger roller 16, the roller 14thus constituting a driving roller, While the roller 16 is a drivenroller to which movement is transmitted through the roller 13. The saidtransmission roller 13 is mounted in a yoke or lsimilar lframe 1S rigidwith the lower end of an-operating or controlling lever 19, said leverbeing fitted diametrically in a pivot 20 mounted in the frame andreinforced by a disk 21. Below the disk 21, a washer 22 is fitted uponthe lever, and a spring 23 is coiled around the lever between thiswasher and the yoke- 18, whereby the tension of the sprmg serves tonormally hold the transmission .roller toward the driving and drivenrollers and in contact therewith'. The driving and driven rollers havetheir surfaces so shaped as vto follow arcs described about the pivot 20as a center, so that the movement of the transmission roller, when theoperating lever is manipulated, will be smooth and easy and will notdestroy the contact between the rollers, but will preserve thefrictional engagement between the same.

The foot lever 24 is utilized to form a fixed stop for the washer 22 andthereby effect the desired operation of the spring 23, and to this end,the said lever is provided at its free end with a stirrup 25 fittingaround the lever 19 above the washer and curved to conform to theperiphery of the disk 21, whereby the movement of the lever, under theinfluence of the spring, will be limited. The foot lever is providedwith the usual foot-rest 26 and may be pivotally secured, as indicatedat 27, at any convenient point of the frame. At a suitable point abovethe pivot, a locking bar or rack 28 is mounted upon the frame, and thelever is equipped with a dog or locking plate 29 v adapted to ride overand engage notches, in-

been set.

dicated at 30, in the edge of the locking bar, whereby to hold the leverin any position to which it may be adjusted, and consequently maintainthe speed for Which the gearing has been set. The notches 30 arepreferably rather shallow to permit the dog 29 to ride easily over thesame when the lever is being shifted, While, at the same time, they aredeep enough to prevent accidental movement of the lever after it has Therack bar is provided at its opposite ends with projections or stops 31to limit the movement of the lever and prevent the same being shifted toa position where the gearing will be rendered inoperative, and adjacentthe rear stop 31 is a deep notch 32 which may be engaged by the dog 29to hold the lever in the position in which the motion -of the drivenshaft will be reversed. 'ImmediatelyA adjacent the said deep notch 32, aprojection 33 is provided on the locking bar, and when the dog 29engages the notch 34 in said projection, the transmission roller will beheld in what may of the driving and driven rollers.

be termed the neutral position, with its ends immediately over thegrooves 15 and 17, so

Vthat the driven shaft will not be coupled to the driving shaft and willconsequently remain at rest. At the opposite end of the locking bar is aprojection 35 having a notch 36, and when the dog 29 engages said notchshaft.

immediately adjacent the larger end of the driven roller 16, is a disk37 having its edge beveledor flared to form a continuation'of the arcdescribed by the surface of the said driven roller, and .this disk isconstructed with an overhanging rim provided with internal gear teeth'38, as shown in Fig. 2. Pinions 39 are mounted on stub shafts 40projecting from the frame to mesh with the internal teeth 38 and alsowith a'pinion 41 carried loosely by a hub 42 which is mounted upon thedriven shaft, so as to rotate therewith and slide thereon. A trip lever43-is suitably fulcrumed upon the frame and has one end engaging thesaid hub 42 and its other end projected into the path of the frame 18 orthe axle 44 therein which carries the transmission roller. Ordinarily,the trip lever 43 is held by a spring, 45, in such position that the hub42 will be drawn from the disk 37, and consequently the rotation of thesaid hub with the driven shaft will have no effect upon the pinions 41and 39. If, however, the transmission roller be shifted to the extremeposition shown in dotted lines in Fig. 1,"the ends of the roller willthen engage the edge of the disk 37 and the smaller circumference of thedriving roller 14 respectively, and consequently motion will be impartedto the disk 37 from the driving roller through the transmision roller.1t will also be noted that in this po- Mounted loosely upon the drivenshaft,

sition of the transmission roller, the axle,

thereof or the yoke 18 'will impin'ge against the free end of the triplever 43, 'so that the said lever will be moved upon its fulcrum, andthe hub 42 consequently moved axially upon the driven shaft 4, so as tobind within the pinion 41, and consequently the .rotation of the disk 37will be transmitted through the pinions 39 to the pinion'41, and thenceto the hub 42 and through the same to the driven shaft which AWill nowrotate in a direction contrary to its movement under the influence ofthe driven roller-16. y

It is, of course, desirable, if not absolutely essential, that the axisof the transmission roller remain in the same plane as the axes Y Toattain this result, I provide one or more guide brackets 46 on the mainframe adjacent the yoke 18 and curved so that in no position ofl centthe yoke, any tendency of the yoke to` twist will throw theend of thesame against the guide, and consequently the twisting tendency will beresisted and overcome.

i It will be readily seen from the foregoing description, taken inconnection with the accompanying drawings, that I have provided amechanism in which all the different speeds required will be obtained bythe manipulation of a single lever, so that the employment of a numberof different levers and clutches, with their resultant interference, isovercome.

The speed attained by the use of the friction rollers may, of course, bevaried by varying the diameters or sizes of the rollers, and to permitasmooth shifting from the friction drive to the direct drive, I prefer tohave the larger end of the driving roller lequal in diameter to thesmaller end of the driven roller, so that when the parts are in theposition shown in full lines in Fig. 1, the two shafts will be moving atabout the same speed, and consequently no jar will be felt when theshafts are coupled directly. It will also be noted that the shiftingfrom the friction drive to the direct drive is aecomplished by swingingthe lever to one limit of its movement, and the reversing of the vehicleis accomplished by swinging the lever to the opposite limit of itsmovement.`

The operating lever is slidably mounted in its pivotal support, and thedisk inelosing said support serves to reinforce the same againstsplitting, and also serves as a stop to limit the upward movement of thefoot lever, and thereby prevent binding of said lever upon the mainlever, and also prevent the washer upon the said main lever beingshifted along the same to such extent that the spring bearing thereonwill lose its effectiveness to hold the transmission roller inengagement with t-he driving and driven rollers. Should the rollers tendto slip, as when the machine is traveling up a steep grade or throughsand or mud, the foot lever 24 may be pressed downward so as to compressthe spring 23 and increase the force exerted thereby so that thetendency to slip will be overcome and the power of the engineeffectually transmitted to the driven shaft. The spring may be initiallyadjusted to any desired tension by means of a nut 2Q mounted on thelever and bearing against the lower end of the spring.

l. In a transmission gearing, the combination of a driving shaft, adriven shaft in axial alinement therewith, rollers on said shafts, atransmission roller frietionally engaging the rollers on the saidshafts, means for shifting said transmission lroller, and means wherebythe movement of said transmission roller will couple the driven shaftdirectly to the driving shaft.

2. Ina transmission gearing, the combination of a driving shaft having aclutch member' at one end, a driven shaft in axial alinement with thedriviner shaft, a clutch member on the driven shaft adapted to engagethe first mentioned clutch member, means for yieldably holding theclutch members out of engagement, rollers on the said shafts, atransmission roller adapted to frictic-nally engage said rollers, and atrip actuated by the transmission roller to shift the clutch membersinto engagement.

3. In a transmission gearing, the combination of a driving shaft havinga clutch member at one end, a driven shaft in axial alinement with thedriving shaft, a clutch member on the driven shaft adapted to engage thefirst-mentioned clutch member, means for yieldably holding the clutchmembers out of engagement, a trip lever mounted to hear upon the clutchmember on the driven shaft, rollers on the said shafts, a transmissionroller adapted to frictionally engage said rollers, and an annularprojec` tion on said transmission roller adapted to engage the said triplever whereby when the transmission roller is swung beyond the rollerson the said shafts the clutch member on the driven shaft will be causedto engage the clutch member on the driving shaft.

4. ln a transmission gearing, the eombination of axially alined shafts,rollers upon the said shafts, a transmission roller adapted tofrictionally engage the firstmentioned rollers, a disk loosely mountedon the driven shaft adjacent the roller thereon, a train of gearingdisposed between the said disk and the driven shaft, a hub rotatablewith said shaft and adapted to lock the same to one element of the trainot" gearing, and means adapted to be actuated by the transmission rollerfor shifting said hub.

5. In a transmission gearing, the combination of axially alined drivingand driven shafts, rollers thereon, a transmission roller adapted tofrictionally engage said rollers, a disk loosely mounted on the drivenshaft and adapted to be engaged by the transmission roller, a norlnallyinactive train of gearing connected with said disk. and means actuatedby the shifting of the transmission roller to lock said gearing to thedriven shaft whereby the motion of said shaft will be reversed.

(i. ln a transmission gearing, the combination of axially alined drivingand driven shafts. tapered rollers on said shafts, the roller on thedriving shaft having an amullar groove near its smaller end and theroller on the driven shaft4 having an annular groove near its largerend, a transmission roller adapted to frictionally engage the taperedrollers, and means for locking the said transmission roller adjacent thesaid annular grooves whereby the driven roller may remain at rest.

7. In a transmission gearing, the cornbinatio'n of driving and drivenshafts, tapered rollers thereon, a transmission roller frictionallyengaging said rollers, a plvotally monntedframe carrying the saidtransmission roller, means for moving said frame to.

vary the point of engagement between the transmission roller and 'thetapered rollers,

and yieldable means acting on said frame to hold the same againstv thetapered rollers.

8. In a transmission gearing, the combination of tapered driving anddriven rollers, a transmission roller frictionally engaging the same, ayoke carrying said transmission roller, a pivotally and slidably mountedlever rising from said yoke and having a stop arranged around thesupport of said lever, a washer upon the lever limited in its movementsby said stop, and a spring coiled around the lever between the yoke andsaid washer. K

9. The combination of a driving roller, a driven roller, a transmissionroller adapted to frict-ionally engage the same, a yoke carrying saidtransmission roller, a slidably and pivotally mounted lever rising fromsaid yoke, a stop around the support of said lever, a foot lever fittingaround the said slid'ably and pivotallysmounted lever and. having itsend shaped to conform to the support of said slidable and pivoted lever,a washer on the said slidable lever bearing against the' end of the footlever, and a spring coiled aro-und the slidable lever between the yokeand said washer.

10. The combination of a driving roller,

'tion of the driving shaft.

'rollers and said disk, an operating Ylever carrying said transmissionroller, a locking' bar, and a dog on the lever adapted to engage saidbar whereby .the `transmission roller may be set to connect the drivingollpr with the driven roller or with the said 12. In a transmissiongearing, the comi bination of alined driving and driven shafts, rollerson said shafts, a transmission roller frictionally en aging saidrollers, whereby the driven-shat the same direction as the driving shaftat will be caused to rotate in.

variable speeds, means' for shifting the' transmission roller in theaxial plane of the driving and driven shafts, means whereby in oneextreme position of the transmission roller the driven shaft will beactuated directly by the driving shaft at the same speed as said shaft,Aand means whereby in the opposite extreme position of the transmissionroller the driven shaft will be rotated in a,

direction opposite to the direction of rota- In testimony whereof Ialiix my signature in presence of two witnesses.

J USTUS H. NAUMANN. [1.. s.] lfVitnesses:

2A. H. Loiim,

D. A. PoDoLL.

